True... and that's a BMW i3. It's practical as a home build, if you use a simple frame as a base with a composite (or even just thermoplastic) body on top.Provably the most reasonable way to build a vehicle like this, will be using a fibre glass/carbon body and reinforce it with internal ribs or a metallic chassis underneath, or may be both.
Speaking of size... with actual hobby printers (not some product that isn't even available yet) what are your maximum part dimensions? Some hobbyists have built quite large 3D printers, but those are not "standard hobby printers". It might make sense to open up the constraints a bit, and consider using a larger printer that can be built from a readily available kit.Even if going throw the 3D printing way, to use just hobby printers is not the right or optimal way. I am aware of that as well.
The most reasonable way of 3D print a car like this, it is probably to use a huge 3D printer and print it all at once or may be in some big parts.